3 … 9
2 … 9
MC • Karl Dungs
, Inc.
• EMP-5 • Edition 2017.05 • P/N 261483
Operation Description
The actuator’s position is proportional to the input current
from the primary controller. The current-to-position convertor
is a solid state switching device attached to the side of the
die cast housing and receives its feedback signal from the
built in potentiometer in the actuator with a wiper arm driven
by the output shaft.
The signal input is factory set from 4 - 20 mADC, (but is field
adjustable). The deadband is also adjustable. Deadband is the
difference between the input signal, which will drive the motor
one way, and the level, which will drive it the opposite way.
All wiring must comply with local electrical
codes, ordinances and regulations .
Three adjustments are possible:
1) degree of counterclockwise travel.
2) the point of auxiliary switch actuation.
3) on the EMP 424-5 and EMP 454-5 models, the ability to
slow the normal travel time by approximately 10 times.
Installation
Inspect unit before installing, look for broken parts or leaks.
Use NEMA Type 4 compatible type connectors.
Observe the barrier that separates the line voltage terminals
from the low voltage which operates the actuator motor. All
connections to the line voltage side of the barrier (L1 and L2,
1, 5 and 6 terminals) must be made with Class 1 wiring; con-
nections to the remaining terminals can be Class 2 thermostat
cable if desired.
Allow 6 inches (152 mm) clearance above the actuator wiring
compartment.
Do not adjust the limit switch beyond 90° unless the standard
slidewire has been replaced with a 180° slidewire; do not
adjust beyond 180° for proportioning control.
In some applications, a Flame Safeguard (FSG) may have
one or two overriding circuits. One being a low fire purge start
and the other a hight fire pre-purage. The function of the violet/
white and violet wires are to provide an electrical connection
so that the FSG can override, the temperatur controller and
drive the air damper actuator without a 4 mA signal. If such
connections are not needed in the application, simply tape
them off, and safely stow away.
Replacing EMP-3 or EMP-4 with EMP-5
• When replacing an EMP-3 or EMP-4 with an EMP-5
and
if the high fire override is not used, then follow the wiring
schematic ”
EMP-4 to EMP-5 without using high fire
override
” for the low voltage input leads.
• When replacing an EMP-3 or EMP-4 with an EMP-5
and
if
the high fire override is used, then follow the wiring sche
-
matic ”
EMP-4 to EMP-5 using high fire override
” for the
low voltage input leads so that the EMP-5 drives closed with
a low fire override input and open with a high fire override
input from the flame safety.
• When replacing an EMP-3 with an EMP-5, there is no need
to connect to the “run” terminal of the flame safety.
• Red wire on EMP-3 is replaced with violet/white wire on
EMP-5, which must be connected to the LOW terminal on
the flame safety and the - lead on the temperature control
-
ler. See schematic below.
• Blue wire on EMP-3 is replaced with blue wire on EMP-5.
• Orange wire on EMP-3 is replaced with yellow wire on
EMP-5.
• When replacing an EMP-4 with an EMP-5, follow the wiring
schematic below for the low voltage input leads so that the
EMP-5 drives closed with a low fire override input and open
with a high-fire override input from the flame safety.
• When replacing an EMP-4 with an EMP-5, there is no need
to connect to the “run” terminal.
• White wire on EMP-4 is replaced with violet / white wire on
EMP-5, which must be connected to the LOW terminal on
the flame safety and the - lead on the temperature control
-
ler. See schematic below.
• Black wire on EMP-4 is replaced with blue wire on EMP-5.
• Red wire on EMP-4 is replaced with yellow wire on EMP-5.
•
•
•
•
•
•
•
•
•
•
•
•
•
+
–
•
Typical Flame Safety Inputs
•
•
•
•
•
•
•
COM
High
Low Run
•
•
•
•
•
135 Ohm
Potentiometer
B
W
R
+
Red
4-20mA
Output
Temperature controller or
Transducer with 24Vdc outlet power
EMP-4 low voltage
input leads
White
Black
+
-
-
Typical Flame Safety Inputs
COM
High
Low Run
Wire nut
EMP-5 low voltage
input leads
Violet/
White
Violet
Blue
Yellow
+
–
4 - 20 mA
Output
135 Ohm
Potentiometer
B
R
W
Temperature controller or
Transducer with 24 VDC outlet power
•
•
•
•
•
•
•
•
•
•
•
•
+
–
Typical Flame Safety Inputs
COM
High
Low Run
EMP-5 low voltage
input leads
Violet/
White
Violet
Blue
Yellow
+
–
4 - 20 mA
Output
135 Ohm
Potentiometer
B
R
W
Temperature controller or
Transducer with 24 VDC outlet power
EMP-4 to EMP-5
without using
high fire override
EMP-4 to EMP-5
using high fire
override
EMP-5 is not a di-
rect replacement in
this case. Additional
wires detailed here
are needed.